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University of California Publications in Geology [VOL. 8 



Dosinia elevata Gabb, Dosinia gyrata Gabb, Glycimeris sagittata Gabb, 

 Meretrix hornii Gabb, Meretrix ovalis Gabb, Meretrix uvasana Gabb, 

 Ostrea aviculaformis Anderson, Placunanomia inornata Gabb, Tapes 

 conradiana Gabb, Tellina longa Gabb, Tellina remondii Gabb, Amau- 

 ropsis alveata Gabb, Bulla hornii Gabb, Fusus californica Gabb, 

 Rimella canalifera Gabb, Turritella merriami Dickerson, Turritella 

 uvasana Conrad, Whitneya ficus Gabb. Many of these forms have a 

 wide range in the Tejon, but so far as known they are not fo.und in 

 the Martinez. There are many other Tejon forms which will serve as 

 guides. The faunal break between the Martinez and the Tejon is 

 very wide when we consider the large number of species which are 

 confined to the one group or the other. 



i 



COMPARISON OF THE UPPEE MARTINEZ AND THE 

 LOWERMOST TEJON 



During the last two Summer Sessions of the University the field 

 classes in palaeontology made extensive collections in the Tejon, south 

 of Mount Diablo. As was mentioned above in describing the small 

 area of Martinez south of Mount Diablo, the Tejon for the most part 

 is in unconformable contact with the Chico. Between Cave Point and 

 Oyster Point a complete section of the Tejon was studied and it was 

 found to be fossiliferous from top to botton. The basal portion in 

 contact with the Chico was most prolific and yielded a very large 

 fauna, a portion of which is given in the list below. This basal fauna 

 was obtained from beds not over twenty-five feet above the bottom of 

 the section. 



PARTIAL LIST OF SPECIES IN THE BASAL TEJON SOUTH OF MOUNT DIABLO 



Fungia(f), n. sp. 

 Turbinolia(f), n. sp., a (long) 

 Turbinolia(?), n. sp., b (short) 

 Coral (reef form), sp. 

 Cassidulus californicus Anderson 

 Scutella, n. sp. 

 Acila, sp. 



Astarte mathewsonii Gabb 

 Avicula pellucida Gabb 

 Cardium cooperi Gabb 

 Cardium, sp. 

 Corbula parilis Gabb 

 Dosinia elevata Gabb 

 Dosinia gyrata Gabb 



Glycimeris cf. sagittata (Gabb) 

 Glycermis cor (Gabb) 

 Leda gabbi Conrad 

 Mactra, sp. 

 Spisula, n. sp. 

 Meretrix hornii Gabb 

 Meretrix ovalis Gabb 

 Meretrix uvasana Gabb 

 Modiolus ornatus (Gabb) 

 Ostrea aviculaformis Anderson 

 Ostrea, sp. 

 Phacoides, sp. 



Placunanomia inornata Gabb 

 Psammobia hornii (Gabb) 



